High Quality BEd Series Explosion-Protected Electro-Hydraulic Thrusters

 

 

2. Working Principle

The BEd Series operates on a sealed electro-hydraulic conversion principle, identical to the standard ED Series but with enhanced explosion-proof measures to contain internal sparks or heat. Its working cycle includes three key states:

2.1 1. Thrust Generation (Brake Release/Clutch Engagement)

When activated, the explosion-proof electric motor (housed in a flameproof enclosure) drives an integrated gear/vane pump. The pump draws hydraulic oil from the sealed internal reservoir and pressurizes it (8–16 MPa, model-dependent).

Pressurized oil flows into a single-acting hydraulic cylinder, pushing the piston and chrome-plated output rod outward. This generates linear thrust (500–12,500 N) to actuate the target brake/clutch-overcoming spring tension to release brakes or engage clutches.

2.2 2. Thrust Retention (Sustained Operation)

Once the output rod reaches maximum stroke (50–200 mm), a pressure relief valve diverts excess oil back to the reservoir. This maintains stable cylinder pressure, keeping the brake released (or clutch engaged) without overloading the motor-critical for continuous-duty machinery like 24/7 mine conveyors.

2.3 3. Thrust Cessation (Emergency/Reset)

In power loss, system leaks, or emergency shutdowns, the motor and pump stop immediately. Hydraulic pressure dissipates, and the brake's return springs (or clutch's reset force) push the output rod back. Oil flows back to the reservoir, allowing the brake to engage (or clutch to disengage) and secure the machinery.

The flameproof enclosure contains any potential internal sparks or overheating, preventing ignition of external flammable gases/dust.

3. Core Structure & Explosion-Protected Components

The BEd Series features a rugged, explosion-safe design with five critical subsystems, all compliant with strict hazardous-area standards:

3.1 1. Flameproof Electric Motor (Power Input)

A three-phase AC induction motor with Exd I Mb/Exd IIB T4 Ga explosion-proof marks (compliant with GB 3836-2010 and ATEX/IECEx standards). It is suitable for:

Underground coal mines: Exd I Mb for methane-rich environments.

Above-ground industries: Exd IIB T4 Ga for Class IIB explosive gas zones (e.g., petrochemicals, gas storage) with temperature class T4 (≤ 135°C).

Motor power ranges from 0.37–7.5 kW, with dual-voltage options (380V/660V, 660V/1140V AC, 50Hz) to match mine/petrochemical power systems. Insulation class is Class F (heat resistance up to 155°C) for high-temperature tolerance.

3.2 2. Sealed Hydraulic Power Unit (Energy Conversion)

Explosion-Safe Pump: A low-noise gear pump (for ≤12 MPa) or vane pump (for 12–16 MPa) with non-sparking materials (e.g., copper-alloy gears) to avoid friction-induced sparks. It is fully enclosed within the flameproof housing.

Airtight Reservoir: A steel reservoir (capacity: 0.5–5 L) with a sealed lid and flameproof breather valve. It prevents oil leakage and blocks external flammable gases from entering the hydraulic system.

Pressure Safety Valves: A relief valve (to limit max pressure) and check valve (to prevent oil backflow) - both with explosion-proof seals to maintain the enclosure's integrity.

3.3 3. Heavy-Duty Hydraulic Cylinder (Force Output)

A single-acting cylinder with a hard chrome-plated output rod (diameter: 20–60 mm) for corrosion resistance and wear reduction. The cylinder bore (40–125 mm) and stroke (50–200 mm) are optimized for heavy thrust demands.

High-Temp Seals: Fluoropolymer (FKM) seals (standard) resist oil leakage and tolerate temperatures from -20°C to 120°C, suitable for hot petrochemical or mine environments.

3.4 4. Flameproof Enclosure (Safety Core)

Cast Steel/Aluminum Housing: A robust enclosure with flameproof joints (gap ≤ 0.15 mm) that cool and contain internal explosions, preventing flame propagation to external explosive atmospheres.

IP65 Protection: The enclosure is dust-tight and water-jet resistant, shielding internal components from mine dust, petrochemical spills, or rain-critical for outdoor/underground use.

Explosion-Proof Cable Glands: Sealed cable entries (compatible with armored cables) prevent gas ingress and ensure no sparks escape through wiring ports.

3.5 5. Installation & Adaptation Components

Universal Mounting: A rotatable flange base (90° adjustment) and 360° swiveling rod head allow vertical, horizontal, or inclined installation, adapting to confined spaces in mine hoists or petrochemical pumps.

Anti-Corrosion Coating: External surfaces are coated with epoxy resin (100μm thickness) to resist mine water, chemical vapors, and salt spray (for offshore petrochemical sites).

4. Key Features & Advantages

The BEd Series stands out for its explosion protection, heavy-duty performance, and compliance, with core benefits for high-risk industries:

4.1 1. Multi-Standard Explosion Safety

Complies with global standards (GB 3836-2010, ATEX 2014/34/EU, IECEx) and covers both underground coal mines (Exd I Mb) and above-ground Class IIB explosive zones (Exd IIB T4 Ga), ensuring versatility across high-risk sectors.

4.2 2. Heavy-Duty Thrust & Durability

Delivers 500–12,500 N of thrust-3–5 times higher than small explosion-proof thrusters (e.g., BYT1 Series)-making it suitable for heavy brakes/clutches in mine hoists, large conveyors, or port cranes.

4.3 3. Sealed & Low-Maintenance Design

The fully enclosed hydraulic system and flameproof housing prevent dust, water, or gas ingress, reducing component wear and maintenance frequency.

Class F insulation and FKM seals ensure a service life of ≥ 10,000 working hours under continuous operation-critical for remote mine sites with limited maintenance resources.

4.4 4. Fast Response & Energy Efficiency

Thrust build-up time (startup to full stroke) is ≤ 0.8 seconds, enabling quick brake release for machinery with short cycle times (e.g., mine hoists).

The pressure relief valve cuts motor load after reaching full stroke, reducing power consumption by 30–50% compared to constant-load systems.

4.5 5. Compatibility with Legacy Systems

Standardized mounting flanges and output rod dimensions match heavy-duty brakes (e.g., YWZ5, YWZ9 series) and clutches, making it a direct replacement for non-explosion-proof ED Series thrusters in retrofitting high-risk machinery.

5. Typical Applications

The BEd Series is purpose-built for medium-to-heavy duty actuation in explosive environments:

Underground Coal Mines: Driving brakes for mine hoists (ore lifting), belt conveyors (coal transport), and shearers; controlling clutches for underground crushers.

Petrochemical/Oil Refining: Actuating emergency brakes for pipeline pumps, tank farm conveyors, and gas compressors; engaging clutches for distillation tower agitators.

Gas Storage & LNG Facilities: Operating brakes for cryogenic tank transfer vehicles and gas loading/unloading cranes in Class IIB explosive zones.

Mining & Metallurgy: Controlling brakes for mineral processing conveyors and hoists in sulfur ore or metal mines with flammable dust/gas.

 

 

 

 

 

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